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// IBM_PROLOG_BEGIN_TAG
// This is an automatically generated prolog.
//
// $Source: src/include/kernel/basesegment.H $
//
// IBM CONFIDENTIAL
//
// COPYRIGHT International Business Machines Corp. 2011
//
// p1
//
// Object Code Only (OCO) source materials
// Licensed Internal Code Source Materials
// IBM HostBoot Licensed Internal Code
//
// The source code for this program is not published or other-
// wise divested of its trade secrets, irrespective of what has
// been deposited with the U.S. Copyright Office.
//
// Origin: 30
//
// IBM_PROLOG_END
/** @file basesegment.H
* @brief Defines the base segment (0TB) class.
*/
#ifndef __KERNEL_BASESEGMENT_H
#define __KERNEL_BASESEGMENT_H
#include <kernel/segment.H>
//#include <kernel/vmmmgr.H>
// Forward declaration.
class MessageQueue;
class Block;
/** @class BaseSegment
* @brief Class to manage the base segment at 0 TB.
*
* Contains a chain of blocks associated with the first segment.
*/
class BaseSegment : public Segment
{
protected:
/**
* @brief Constructor.
* Initialize attributes and set base addresss of segment to 0 TB.
*/
BaseSegment() : Segment(0x0), iv_block(NULL), iv_physMemSize(0) {};
/**
* @brief Destructor
* Delete any blocks owned by this segment.
*/
~BaseSegment();
public:
/**
* @brief Initialize the segment by allocating initial blocks and
* adding to the segment manager.
*/
static void init();
/**
* @brief Implementation of the pure-virtual function from Segment.
*
* Calls block chain to deal with page fault.
*/
virtual bool handlePageFault(task_t* i_task, uint64_t i_addr,
bool i_store);
/**
* @brief Implementation of the pure-virtual function from Segment.
* Update LRU statistics on the block that owns the address
*
* @param[in] i_vaddr - Virtual Address of page
* @param[in] i_stats - Usage statistics
*/
virtual void updateRefCount( uint64_t i_vaddr,
PageTableManager::UsageStats_t i_stats );
/**
* @brief Allocates a block of virtual memory of the given size
* @param i_mq[in] - Message queue to be associated with the block
* @param i_va[in] - Page aligned base virtual address of the block
* to be allocated
* @param i_size[in] - Requested virtual memory size of the block
* @return int - 0 for successful block allocation, non-zero otherwise
*/
static int mmAllocBlock(MessageQueue* i_mq,void* i_va,
uint64_t i_size);
/**
* @brief Locate the physical address of the given virtual address
* @param[in] i_vaddr virtual address
* @return the physical address bound to the virtual address, or
* -EFAULT if i_vaddr not found. @see errno.h
*/
virtual uint64_t findPhysicalAddress(uint64_t i_vaddr) const;
/**
* @brief Remove pages by a specified operation of the given size
* @param[in] i_op - Page removal operation to perform
* @param[in] i_vaddr - Virtual address associated to page(s)
* @param[in] i_size - Size of memory to perform page removal on
* @param[in] i_task - Task requesting page removal.
* @return int - 0 for successful page removal, non-zero otherwise
*/
static int mmRemovePages(VmmManager::PAGE_REMOVAL_OPS i_op,
void* i_vaddr, uint64_t i_size, task_t* i_task);
/**
* @brief Sets the page permissions for a given virtual address and size.
* @param i_va[in] - virtual address of the page(s) to set permissions
* @param i_size[in] - range of memory that needs permissions updated...
* if i_size equals 0 then we only need to update an
* individual page.
* @param i_access_type[in] - type of permission to set
* @return int - 0 for successful block allocation, non-zero otherwise
*/
static int mmSetPermission(void* i_va,
uint64_t i_size,
uint64_t i_access_type);
/**
* @breif Cast out older physical memory pages
* @param[in] castout Constraint
*/
virtual void castOutPages(uint64_t i_type);
private:
/**
* @brief Internal implementation of init function.
*/
void _init();
/** Block-chain associated with this Segment. */
Block* iv_block;
/** Physical memory byte size */
uint64_t iv_physMemSize;
/**
* @brief Allocates a block of virtual memory of the given size
* @param i_mq[in] - Message queue to be associated with the block
* @param i_va[in] - Base virtual address of the block to be allocated
* @param i_size[in] - Requested virtual memory size of the block
* @return int - 0 for successful block allocation, non-zero otherwise
*/
int _mmAllocBlock(MessageQueue* i_mq,void* i_va,uint64_t i_size);
/**
* @brief Sets the page permissions for a given virtual address and size.
* @param i_va[in] - virtual address of the page(s) to set permissions
* @param i_size[in] - range of memory that needs permissions updated...
* if i_size equals 0 then we only need to update an individual
* page.
* @param i_access_type[in] - type of permission to set
* @return int - 0 for successful block allocation, non-zero otherwise
*/
int _mmSetPermission(void* i_va,
uint64_t i_size,
uint64_t i_access_type);
/**
* @brief Remove pages by a specified operation of the given size
* @param[in] i_op - Page removal operation to perform
* @param[in] i_vaddr - Virtual address associated to page(s)
* @param[in] i_size - Size of memory to perform page removal on
* @param[in] i_task - Task requesting page removal.
* @return int - 0 for successful page removal, non-zero otherwise
*/
int _mmRemovePages(VmmManager::PAGE_REMOVAL_OPS i_op, void* i_vaddr,
uint64_t i_size, task_t* i_task);
};
#endif
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